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Alternative treatments to improve the potential of rice husk as adsorbent for methylene blue
- Source :
- Water Science and Technology. 75:296-305
- Publication Year :
- 2016
- Publisher :
- IWA Publishing, 2016.
-
Abstract
- Alternative treatments, such as, NaOH, ultrasound assisted (UA) and supercritical CO2 (SCO2), were performed to improve the potential of rice husk as adsorbent to remove methylene blue (MB) from aqueous media. All the treatments improved the surface characteristics of rice husk, exposing its organic fraction and/or providing more adsorption sites. The Langmuir and Hill models were able to explain the MB adsorption for all adsorbents in all studied temperatures. The experimental and modeled parameters demonstrated that the MB adsorption was favored by the temperature increase and by the use of NaOH-rice husk. The maximum adsorption capacities for the MB solutions (ranging from 10 to 100 mg L−1), estimated from the Langmuir model at 328 K, were in the following order: NaOH rice-husk (65.0 mg g−1) > UA-rice husk (58.7 mg g−1) > SCO2-rice husk (56.4 mg g−1) > raw rice husk (52.2 mg g−1). The adsorption was a spontaneous, favorable and endothermic process. In general, this work demonstrated that NaOH, UA and SCO2 treatments are alternatives to improve the potential of rice husk as adsorbent.
- Subjects :
- Langmuir
Environmental Engineering
02 engineering and technology
010501 environmental sciences
01 natural sciences
Husk
Endothermic process
Water Purification
symbols.namesake
chemistry.chemical_compound
Adsorption
0105 earth and related environmental sciences
Water Science and Technology
Environmental engineering
Langmuir adsorption model
Oryza
Hydrogen-Ion Concentration
021001 nanoscience & nanotechnology
Supercritical fluid
Organic fraction
Methylene Blue
Kinetics
chemistry
symbols
0210 nano-technology
Water Pollutants, Chemical
Methylene blue
Nuclear chemistry
Subjects
Details
- ISSN :
- 19969732 and 02731223
- Volume :
- 75
- Database :
- OpenAIRE
- Journal :
- Water Science and Technology
- Accession number :
- edsair.doi.dedup.....c28e213e86f2d5adea24017017c626f5
- Full Text :
- https://doi.org/10.2166/wst.2016.504